Incandescent safety lamp for mines



April 2l, 1925.

L. E. F. FERRETTE INCANDESCBNT SAFETY FOR MINES original Filed Feb. 17, i922 Patented pr. 21, 1925'.

UNITED STATES N 1534,37@ PATENT orifice..

LOUIS ERNEST FRANQOIS JEEli/RETTE,` 0F PARIS, FRANCE.

INCANDESGENT SAFETYrk LAMP EUR MINES.

Original application led February 17,1922, SerialNo. 537,223.5. Divided and this application led November 21, 1923.` Serial No. 676,155.

i to a burner provided with a mantle for the i iblediaphragms (or a diaphragm) capable` production of an incandescent light, and in which means are also provided for control ling the supply ofilluminant.

According to the present invention the means for controlling thesupply of illuminant comprises a valve supported by fienof beingr adjusted in `order to varythe position of the valve, so as to control the supply opening `for the illuminant or to close said open1ng,'as desired. Y

of the ball towards or away` from its seat.

CAG

When the lamp is inverted `the ball moves by gravity to close the passage of the illuminant to the burner, thus obiviating eXplosions. e i

In order that the invention may be clearly understood, reference is made to the annexed drawing which illustrates, by way of example, a vertical sectional view of one form of the present invention as applied tov a miners safety lamp of the type described in my Patent No. 1,496,261, granted June 3, 1924, of which the present case is a division.

` lteferringto the drawing: y

As will be seen, the safety lamp comprises amain illuminant reservoir 1 within which is disposed a smaller auxiliary reservoir 2 communicating `with the said reservoir 1. The lamp also comprises a part 3 closing the reservoir 1; a brass nut or plug 4, screwed into the said part, closing an aperture therein. A. valve seat 7 is provided at the under side of the plug 4l and is in cominunicationV with a tube 6 through which the vapors fromthe liquid illuminant contained in the reservoir 2 pass upwards to a burner 1'? located at the upper end oi' the tube immediately below an` incandescent mantle 5. A steel diaphragm 8 is disposed in the upper part of the main reservoir l and is provided, upon its upper face, with a. cup 9 on which is supported a hardened copper ball 10 adapted, in a manner to be described hereafter, to close an aperture in the valve seat Y.

A. diaphragm 12 is arranged in the lower `part ofthe main reservoirv 1 and is connected to the diaphragm 8 by means of a rod 11 disposed between said diaphragme. An adjusting screw 14C, screwed ythrough a plate 13 attached to the bottom wall of the main reservoir, bears on the underside of the diaphragm 12.

As previously stated, the auxiliary `reservoir 2 is in communication with the reservoir land, therefore, also contains liquid illuminant. rlhe vapors from said liquid illuminantfpass upwards through a capillary tube 15, preferably of copper, which is formed at its upper part with a coil or spiral, l

as will` be seen from the drawing, and which serves as a suspensionmeans for the mantle 5 and` as a `vaporizer for the liquid illuminant. Y 'y ln operation, the vapors produced in the initially heated vaporizer 15 from the liquid iliuminant enter a chamber' 16 formed in the plug l and closed at its bottom by the diaphragm 8. i e

In order to allow the vaporized illuminant to pass upwards from the chamber 16 through the aperture in the valve seat 7 and through the tube 6 to the mantle 5, the adjusting screw 111 is loosened so that the ball lO moves downwards away from the valve seat 7. When it is required to reguvlate the feed of illuminant to the mantle 5, it is only necessary to adjust the screw 111 so that the ball 10 is moved either nearer to or `farther away from the valve seat 7, as required.

When the lamp is not lighted the ball 10 can be maintained in position against the valve seat 7 `by means of pressure applied to the lower diaphragm 12 by the adjusting screw 14 and communicated by the rod 11 to the upper diaphragm S which forces the cup 9, and the ball 'l0 seated thereon, upwards.

lf the lamp is inverted, it will be obvious that the ball l() will close the passage ot the vaporized illuininant from the chamber 16 to the tube 6, cutting oli' the supply thereof to the mantle and thus obviating explosions.

Having now particularly described and ascertained the nature ot my said invention and in what manner the same is to be performed` I declare that what l claim is l. A, lsafety lamp7 comprising` a normallyopen valve 'lor controllin the supply of illr-n'iinant to the burner, adapted to move auteiuati ally into closed position when. the lamp is overturned to shut ott the supply; and a flexible diaphragm lor supporting the valve adapted to be adjusted to vary the normal position ot said valve with relation to the supply ol'ieniug tor the illuminant.

A safety lamp, comprising' a normallyopen valve for controlling` the supply of illuminant to Ithe burner; a flexible diaphragm in the upper part of the lamp reservoir for ireely supporting the valve; a flexible diaphragm in the lower part of said reservoir; a vertical rod connecting` said diaphragms; and an adjusting` screw engaging the lower diaphragm for moving both diaphragms in unison with a consequent movement of the valve toward or from its seat.

A safety lamp, according` to claim 2, in which the valve takes the form of a ball which auton'iatieally shuts off the supply ot illuminant to the burner when the lamp is overturned.

4. A safety lamp, comprising a reservoir for liquid fuel: a burner; a tube leadingthereto; a fuel feed system leading to the burner tube; a cup at the mouth of the burner tube; a ball normally occupying; said cup to leave the tube mouth open, but adapted to ilall out ot the cup into position to close said mouth and thereby arrest the feed when the lamp is overturned; and an adjusting device i'or moving said cup toward and from the tube mouth.

.7. A safety lamp, comprising a reservoir AI'or liquid fuel; a burner; a tube leading thereto; a fuel feed system leading to the burner tube; a cup at the mouth of the burner tube.; a diaphragm whcreon said cup is mounted; a ball normally occupying said cup to uncover the tube mouth, but adapted to Jiall out ot the cup into position to close said mouth and thereby arrest the 'feed when the lamp is overturned; a vertical rod having' its upper end disposed immediately beneath said cup; and an adjusting' device iulliacent the/lower end of said rod 'for moving` the latter endwise to vary the position ot the cup` with relation to the tube mouth.

6. A safety lampf comprising a reservoir for liquid fuel; a burner; a tube leading thereto; a fuel toed system leading to the burner tube; a cup at the mouth of the burner tube; a diaphragm whereon said cup is mounted; a ball normally occupying said cup to uncover the tube mouth, but adapted to tall out oit the cup into position to close said mouth and thereby arrest the -feed when the lamp is overturned; a diaphragm at the bottom of the reservoir; a rod between the diaphragme having its upper end disposed immediately beneath said eup and its lower end supported on the lower diaphragm; and an adjusting screw beneath said lower diaphragm engaging the same in line with the said rod to raise or lower the latter and thereby vary the position ot the cup with relation to the tube mouth.

In testimony whereof I ailix my signature.

l LOUIS ERNEST FRANCOIS FERRETTE. 

